Effect of Adding Amount of Calcined Coal Gangue with High Pozzolanic Reactivity on Cement Compressive Strength

Abstract

Abstract: Comprehensive utilization of coal gangue is the fundamental method to solve the environmental and social problems caused by coal gangue. Coal gangue can be used as a gel material, which is an important mode for coal gangue comprehensive utilization. High reactivity is an essential characteristic for gel materials. Therefore, it is necessary to analyze the influence of high reactivity coal gangue on cement strength, especially the quantitative law. The gangue from Cuipingshan coal mine in Longyan was taken as the research object, and the calcined activation of coal gangue under different calcination temperatures was tested by pozzolanic reactivity evaluation method. The calcined coal gangue with high pozzolanic reactivity was used to make cement specimens, and the influence of coal gangue adding amount on cement compressive strength was analyzed. The results show that with the increase of calcination temperature, the loss on ignition of coal gangue increased gradually, and there is a power function relationship between the loss on ignition and the calcination temperature. With the increase of calcination temperature, the reactivity of coal gangue increases at first and then decreases. The relationship between calcium absorption and calcination temperature is quadratic polynomial. It is inferred that the optimal calcination temperature of experimental coal gangue is 750 ℃. With the increase of coal gangue adding amount, the compressive strength of cement specimens shows a downward trend, and the compressive strengths of specimens have an exponential relationship with the adding amount of coal gangue. With the increase of curing age, the compressive strengths of cement specimens have an increasing trend. The influence of coal gangue adding amount on cement compressive strength and the relationship between coal gangue adding amount and cement strength through data fitting, which provide a reference for coal gangue as cement admixture in other areas, and are of great significance in guiding the application of coal gangue in gel materials.

Key words: coal gangue, cement, calcined activation, pozzolanic reactivity, loss on ignition, compressive strength

CLC Number:

TQ172

LIU Qian, GUO Yusen, ZHONG Tao, HUANG Qingyun. Effect of Adding Amount of Calcined Coal Gangue with High Pozzolanic Reactivity on Cement Compressive Strength[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 936-942.

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